<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
<!--   背景色网站： www.grabient.com-->
    <title>Title</title>
    <style>
        /*径向渐变，圆形渐变*/
        body{
            background-color: #21D4FD;
            background-image: linear-gradient(332deg, #21D4FD 0%, #B721FF 100%);
        }
    </style>
</head>
<body>
哈哈哈
</body>
</html>